Rack



FIG. 1 is a top front perspective view of a rack which embodies the present design;

FIG. 2 is a front view of the rack;

FIG. 3 is a right view of the rack, the left side view being a mirror image thereof;

FIG. 4 is a back view of the rack;

FIG. 5 is a top view of the rack; and,

FIG. 6 is a bottom view of the rack. 

The ornamental design for a rack, as shown and described. 